| n | mean | sd | min | max | |
|---|---|---|---|---|---|
| Trait self-control | 162 | 2.83 | 0.52 | 1.85 | 4.31 |
| Concentration (CIS) | 162 | 3.93 | 1.12 | 1.60 | 6.80 |
| Disturbances in sleep quality (PSQI) | 149 | 5.91 | 2.43 | 1.00 | 15.00 |
| Chronotype (MCTQ) | 140 | 5.11 | 1.08 | 2.44 | 8.08 |
| Alcohol usage (AUDIT) | 149 | 8.89 | 5.23 | 0.00 | 25.00 |